Overdiagnosis is not a problem, but misdiagnosis may be as people are driven into the private sector by long waits, and sadly, missed diagnoses remain common —Tamsin Ford
Experts are warning that far from being over-diagnosed, people with ADHD are waiting too long for assessment, support and treatment.


From the linked research article:
So is Admin Prevalence > Prevalence Estimates where the estimates are made based on representative population-based samples?